实现边框设置0.5px

border-top: 1px solid #ededed; 

显示太粗或者不满足UI设计稿显示

修改

  position: relative;
    &::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        box-sizing: border-box;
        width: 200%;
        height: 2px;
        border-top: 1px solid #ededed;
        transform-origin: 0 0;
        transform: scale(0.5);
      }